The game in question being a jam entry is what makes it that much more sensitive to me.
Don't get me wrong, it is no laughing matter when a full scale game, which might be providing much needed sustenance to the developer, is being de-indexed. And though that developer probably has other channels to promote the game and ultimately overcome such hurdle, it still hurts.
But consider game jam participants. They've likely just finished an exhausting stretch of several days of full-time game development. For some it may have been their first game. For others, it was another step up from their previous tries. Most of them likely never released a game outside of jams. Some are on their last legs, while others have also put considerable effort into the jams, their blood, sweat and tears.
And then there's the rating period. itch.io is by far the largest, most popular jamming platform, and a lot of these jams use this site's convenient functionality for the ratings. Once again, some aim for the first place. Others seek a few precious drops of feedback. But being randomly excluded out of ratings for even a day, especially in the early days of the rating period (which rarely lasts more than a week), can effectively nullify the creators efforts. Nullify. Doom. All of that. And by no means there is a track record of swift responses to those issues from the support, so it's likely to be more than a day.
Of course, there are options, but those options put additional effort on the shoulders of jam organizers and cause friction with the participants, purely because using itch.io is the "status quo".
This is is a titan in the game dev scene. I am in no small amount grateful for the opportunities it provided for us jammers. But though there is no alternative, the issue at hand raises the question of itch being a viable platform for jams going forward.